T874R THERMOSTATS AND Q674L SUBBASES
OPERATION
n a 2 -h e a t th e rm o sta t, th e tw o s ta g e s o f he a t make
s e q u e n tia lly a s th e te m p e ra tu re d ro ps. Make re fe rs to th e
m e rc u ry s w itc h in itia tin g a c a ll fo r h ea t o r cool.
T he re is a b o u t 1° F (0 .6 ° C) b e tw e en s ta g e s s o th e s e c
o nd s ta g e m a k e s o n ly w h e n th e firs t s ta g e ca n n o t h an dle
th e lo a d . T h e 1° F (0.6° C) is re fe rre d to a s th e interstage
differential
T he lig h t e m ittin g d io d e s (L E D ) o n the s u b b a se lig h t w h e n
so m e th in g s p e c ific h a p p e n s w ith in th e s ys te m . W h e n an
LE D lig hts, re fe r to th is list fo r the m ea nin g:
E M . H T.: E m e rg e n c y h ea t is o pe ra tin g. T h e c o m p re s
s o r h as fa ile d , a n d th e h ea t p um p is n ot o pe ra tin g.
L E D lig hts w h e n s ys te m sw itc h is p la ce d in th e
E M .H T . p o sitio n b y th e h o m e o w n e r.
A U X .H T .: A u xilia ry h ea t is o p e ra tin g, w h ic h m e a n s the
w e a th e r is so c o ld th a t th e he a t p um p c an no t h an dle
th e lo ad.
C H E C K : S y s te m n e e d s to be c he ck ed . S e e h e a tin g
s y s-te m in s tru ctio n s fo r s p e cific m e an in g.
N T E : L E D s a re n o t fie ld re p la ce a ble o r a dd a b le .
®) RECYCLING NOTICE
T h is c o ntro l c o nta in s m e rcury in a s e a le d tube. D o no t
pla ce co ntro l in the tra sh a t the end o f its u se ful life.
If th is c o n tro l is re p la c in g a c o ntro l th a t c on ta in s
m e r-c u ry in a s e a le d tu be , d o notp la ce y o u r o ld
co ntro l in th e tra sh .
C o n ta ct y o ur lo cal w a s te m a n a g e m e n t a u th o rity fo r
in s tru c tio ns re ga rd in g re c y clin g a n d th e p ro pe r
d is po sa l of th is c o ntro l, o r o f a n o ld c o ntro l
co n ta in in g m e rc u ry in a s e a le d tub e .
INSTALLATION
When Installing this Product...
1. R e ad th e s e in s tru ctio n s c a re fu lly . F a ilu re to fo llo w
th e m c o u ld d am a g e th e p ro d u ct o r c a u s e a h az a rd
o u s c o nd itio n.
2. C h e ck th e ra tin g s g iv e n in th e in s tru ctio n s a nd on
th e p ro du ct to m a k e su re th e pro d u ct is s u ita b le for
y o u r a p p lic a tio n.
3. In sta lle r m u st be a tra in ed , e x p e rie n ce d s erv ic e
te c h n ic ia n .
4 . A fte r in sta lla tio n is co m p le te , c h e c k o u t p ro du ct
o pe ra tio n a s p ro vid e d in th e se in stru ctio n s.
A CAUTION
1. D is co n ne ct p o w e r s u p p ly to p re v e n t e le ctrica l
s h o c k o r e q u ip m e n t d a m a ge .
2. T o p re v e n t in te rfe re n c e w ith th e th e rm o sta t
lin ka g e , k e ep w ire le n gth to a m in im u m and
ru n w ire s a s c lo se a s p os s ib le to th e s u bb ase .
3. P u s h e x c e s s w ire b a c k in to th e ho le a nd plug
h o le to pre ve n t d ra fts fro m a ffe ctin g th e rm o
s ta t o pe ra tio n .
4. D o not o v ertig h te n th e rm o sta t c a p tiv e
m o u n tin g s cre w s b e c a u se d a m a g e to
s u b b as e th re a d s c a n result.
5. D o not s h o rt a c ro s s coil te rm in a ls o n h ea tin g
re la y o r g a s v a lv e . T h is ca n burn o u t th e
th e rm o s ta t h ea t a ntic ip a to r.
6. N e v e r in sta ll m o re th a n o ne w ire p e r te rm in al
u nle ss fa cto ry -s u p p lie d ju m p e r w ith sp ad e
te rm in a ls is u s e d .
IMPORTANT
Thermostats are calibrated at the factor using
subbase mounted at true level Inaccurate
subbase leveling causes the actual temperature
to deviate from the setpoint temperature.
Location
In sta ll th e th e rm o s ta t a b o u t 5 ft (1 .5 m ) a b o v e th e flo o r in
a n a re a w ith g o o d a ir c irc u la tio n a t a ve ra g e te m p e ra tu re .
D o n o t in sta ll th e th e rm o sta t w h e re it c a n be a ffe c te d by:
— d ra fts o r d e a d s p ots b e h in d d o o rs a nd in co rn ers .
— h o t o r c o ld a ir fro m du c ts .
— ra d ia nt he a t fro m su n o r a pp lia n ce s .
— c o n ce ale d p ip e s a n d ch im n eys .
— u n h e a te d (u n c oo le d) a re a s s u c h a s an o uts id e w a ll
b eh in d th e th erm o sta t.
Mounting The Subbase
T he th e rm o sta t s u b b a se c an be m o u n te d o n a v e rtic a l
o u tle t b ox , h oriz o n ta l o u tle t b o x o r d ire c tly on th e w a ll.
1. If y ou m u st m o u n t th e s u bb a s e o n a v e rtic a l o utle t
box, o rd e r H o ne y w e ll 1 93 12 1A A d a p te r A s s em b ly .
S e e Fig. 1. T h e a s s e m b ly in clu d e s a n a d a pte r ring,
tw o s cre w s a n d a c o ve r p la te to c o v e r m a rk s o n th e
w a ll. Insta ll th e rin g a nd c o ve r p la te on th e v e rtic a l
o u tle t b ox.
F o r a w a ll in sta lla tio n , h o ld s u b b a s e in p o sitio n a nd
m a rk h o le s fo r a n c h ors . S e e F ig. 2. b ta in w a ll
a n c h o rs lo c a lly. B e ca re fu l th a t th e w ire s d o n ot fall
b ac k in to th e w a ll o p en in g. S e t a s id e s u bb a se . D rill
tw o 3 /1 6 in. (5 m m ) h ole s a n d g e n tly ta p an ch o rs
in to the h ole s u n til flu sh w ith th e w a ll.
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